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Empirical relations between magnitudes and fault parameters for earthquakes in Iran

DEPARTMENT OF GEOLOGICAL SCIENCES OLD DOMINION UNIVERSITY, NORFOLK, VIRGINIA 23508

Abstract

Observations on fault displacement D, fault length L, and surface-wave magnitude M_s, larger than 6, for 14 well-studied earthquakes in Iran are considered and the following relationships are established

1. M_s = 1.259 + 1.244 log L

2. M_s = 3.829 + 0.633 log LD

3. M_s = 4.841 + 0.398 log LD²

4. M_s = 6.575 + 0.999 log D

5. log D = –3.832 + 0.914 log L

where L and D are in meters.

For 10 earthquakes, all the models pass the analysis of variance F test at the 95 per cent confidence level. In addition, the multiple correlation coefficients for equations (1) to (4) are above 0.90, and equation (2) has the highest value of 0.970. This value for equation (5) is only 0.747. Using these equations together with worldwide data, for the relation between M_s and log W, where W is the fault width, the following equation

is established between seismic moments, M_o and M_s. Moments obtained by this equation are in very good agreement with those obtained either from surface-wave and body-wave data or from field observations.

This article has been cited by other articles:

				D. L. Wells and K. J. Coppersmith New empirical relationships among magnitude, rupture length, rupture width, rupture area, and surface displacement Bulletin of the Seismological Society of America, August 1, 1994; 84(4): 974 - 1002. [Abstract] [PDF]